In addition to cleaning and lubricating the cams, you also need to make sure that the rake adjustment plates (in the upper castings) are set properly. If the rake adjustment plate is set too far aft, the upper casting can shift back when kicking up the rudders and the plate will slip past the cam without actually tripping the cam. You will be left with a cam in the locked "down" position even though the rudders are up.
To check the rake adjustment plate, put the boat on the trailer and lock the rudders down so that the cams are engaged. Then grab each rudder and try to move the tip forward and aft. If there is a lot of slop in the fore/aft position of the rudder (with the rudder locked down), it means the rake adjustment plate needs to be re-positioned. Loosen the bolt on the top of the upper rudder casting using a 1/2" socket. Push and hold the rudder blade as far forward in the lower casting as it will go. Then slide the rake adjusting plate & bolt as far forward in the upper casting as they can go so the plate is fully seated against the cam and re-tighten the bolt. Then check the rudder locking operation.
If you're still having issues with the cam not tripping properly after positioning the rake adjustment plate, then most likely you have the cam tension screw set too tight, you need to lubricate the cam/plunger, or you need a new cam.
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